Firstly, if you can, get a bunch of boxes of paperclips and put them in plausible hiding places. Depending on how they are marked, it might buy you some time.
Some ideas:
Lock it in a safe or strongbox only you know the code for.
Unscrew a plug socket or light switch from the wall, put it in the cavity, and then reattach it.
Get a photograph with a metal frame and slip the paperclip behind the picture itself.
Find some other metalic easy to dismantle thing and hide the clip inside.
Throw it down a drain or other hole, you can use a magnet on a string to retrieve it.
I assume the investigator will systematically remove everything and sweep it with a metal detector. Hopefully these hiding places won’t be as obvious.